ActionController::StatusCodes::SYMBOL_TO_STATUS

本文链接：https://blog.youkuaiyun.com/iteye_15783/article/details/81972878

本文详细介绍了HTTP协议中常见的状态码及其含义，从1xx系列到5xx系列，覆盖了客户端及服务器端可能出现的各种响应情况。

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 100 = :continue
 101 = :switching_protocols
 102 = :processing
 200 = :ok
 201 = :created
 202 = :accepted
 203 = :non_authoritative_information
 204 = :no_content
 205 = :reset_content
 206 = :partial_content
 207 = :multi_status
 226 = :im_used
 300 = :multiple_choices
 301 = :moved_permanently
 302 = :found
 303 = :see_other
 304 = :not_modified
 305 = :use_proxy
 307 = :temporary_redirect
 400 = :bad_request
 401 = :unauthorized
 402 = :payment_required
 403 = :forbidden
 404 = :not_found
 405 = :method_not_allowed
 406 = :not_acceptable
 407 = :proxy_authentication_required
 408 = :request_timeout
 409 = :conflict
 410 = :gone
 411 = :length_required
 412 = :precondition_failed
 413 = :request_entity_too_large
 414 = :request_uri_too_long
 415 = :unsupported_media_type
 416 = :requested_range_not_satisfiable
 417 = :expectation_failed
 422 = :unprocessable_entity
 423 = :locked
 424 = :failed_dependency
 426 = :upgrade_required
 500 = :internal_server_error
 501 = :not_implemented
 502 = :bad_gateway
 503 = :service_unavailable
 504 = :gateway_timeout
 505 = :http_version_not_supported
 507 = :insufficient_storage
 510 = :not_extended